A sweat test measures the amount of sodium you lose in your sweat. This number is unique to you and helps us create a personalized hydration strategy tailored to your body's needs.

It’s non-invasive and doesn't require exercise. We use a medical-grade patch to collect a small sweat sample while you're at rest. Then we analyze your sodium loss and explain what it means for your hydration, performance, and recovery.

You’ll receive a detailed sodium loss report and a personalized hydration strategy to match your unique needs.

The entire appointment takes about 30–45 minutes, including explanation and results review.

Your sweat test will take place in Sandy, Utah. The exact location and directions will be emailed to you immediately after booking.

If you need help or have special access needs, you can reach out to kristen@runonfuel.com.

Kristen Davis, RD, CSSD, holds a Master’s in Dietetics and is an experienced athlete. She specializes in helping active individuals optimize performance and hydration.

Nope! The test is done at rest using a small patch on your arm. You can leave your gym clothes at home — no workout required.

A patch is placed on your forearm to gently stimulate sweat. It’s safe, painless, and non-invasive.

Sweat rate is how much fluid you lose — usually measured in liters per hour — and it can vary a lot based on things like temperature, humidity, fitness level, and intensity of exercise.

Sweat sodium composition is how salty your sweat is — how much sodium you lose per liter of sweat. Unlike sweat rate, this number stays very stable after infancy. It’s largely genetic and doesn’t change much with training or climate.

💧 Sweat rate = How fast the faucet is running
🧂 Sweat sodium = How salty the water is

See below for more on how to calculate your sweat rate

Sweat Rate

Yes — the sweat test is highly accurate. The same method is used in the medical field to diagnose cystic fibrosis. The patented device we use (through Precision Hydration) is considered the clinical standard for measuring sweat sodium and is trusted by professional athletes, healthcare systems, and research institutions.

No! Anyone who sweats heavily, trains in the heat, or struggles with hydration can benefit.

Yes. If electrolyte loss is a cause, knowing your sodium loss can help prevent both.

Yes — it’s non-invasive and used by elite athletes, military units, and medical professionals worldwide.

Usually just once. Sweat sodium levels are mostly genetic and remain consistent over time.

Yes! You can book a 1-on-1 nutrition consultation to take place alongside your sweat test. These combined appointments must be scheduled at least 1 week in advance and require a brief intake form so Kristen can tailor her guidance to your nutrition habits, performance goals, and sweat data.

The session is $450, includes a full nutrition consultation and sweat test, and lasts approximately 90 minutes. If you're serious about optimizing performance in training and competition, this session is for you.

Request a Combined Appointment